m=[1,2,3,4,5]
m.append(11)  #m=[1,2,3,4,5,11]
n=['a','b']
print(m+n)  #m=[1,2,3,4,5,11,'a','b']
print(m.extend(n))  #m=[1,2,3,4,5,11,‘a’,‘b’,‘a’,‘b’]
print(m.append(n))  #m=[1,2,3,4,5,11,‘a’,‘b’,‘a’,‘b’,['a','b']]